Flora of North America species comparison

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Solidago rigida subsp. humilis
Photo is of parent taxon
Stems

40–70(–90) cm, densely (less coarsely) hispid (30–70 hairs/mm2).
Leaves

basal (often numerous), small, rarely exceeding 120 × 50 mm;

faces densely (less coarsely) hispid (20–60 hairs/mm2);

mid to distal lanceolate to ovate.
Peduncles

densely hispido-strigose.
Disc corolla

lobes shallow, 0.9–1.2(–1.3) mm.
Phyllaries

outer densely strigillose;

inner often more nearly linear, 0.7–1.2 mm wide, conspicuously strigillose.
Heads

in tightly clumped, usually rounded arrays, 3–13(–23.5) × (3.5–)6–13(–18) cm.
Cypselae

usually strigillose distally.
2n

= 18.

Solidago rigida subsp. humilis
Phenology Flowering Aug–Oct.
Habitat Dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods
Elevation 200–1900+ m (700–6200+ ft)
Distribution
from FNA
CO; IA; IL; IN; KS; MI; MO; MT; ND; NE; NM; OK; SD; TX; WI; WY; AB; MB; ON; SK
[BONAP county map]
Discussion

Subspecies humilis is introduced in Illinois, Indiana, Michigan, and Ontario. The involucres are slightly smaller than those of typical variety.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 163.
Parent taxa Asteraceae > tribe Astereae > Solidago > sect. Ptarmicoidei > Solidago rigida
Sibling taxa
S. rigida subsp. glabrata, S. rigida subsp. rigida
Synonyms S. rigida var. humilis, Oligoneuron bombycinum, Oligoneuron canescens, Oligoneuron rigidum var. humilis, S. bombycinum, S. canescens, S. jacksonii var. humilis, S. parvirigida, S. rigida var. canescens
Name authority (Porter) S. B. Heard & Semple: Canad. J. Bot. 66: 1805. (1988)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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